How to list specific type of files in recursive directories in shell?

Question

How can we find specific type of files i.e. doc pdf files present in nested directories.

command I tried:

$ ls -R | grep .doc

but if th

Answer 1

If you have files with extensions that don't match the file type, you could use the file utility.

find $PWD -type f -exec file -N \{\} \; | grep "PDF document" | awk -F: '{print $1}'

Instead of $PWD you can use the directory you want to start the search in. file prints even out he PDF version.